Smallwood. — Maturation Uamiuea. 



PLATE 5. 



Fig. 25. Metaphase of first maturation. Tlie ccntriole in tlie deep centrosome is 

 represented by several small granules. The chromosomes are still in 

 the tripartite condition. Iron haemato.vylin and Bordeaux red. 

 X 1920. 



Figs. 26, 27. Beginning of anaphase of first maturation. The chromosomes are 

 moving toward the poles of the spindle. Iron hajmatoxylin. X 1020. 



Fig. 27a. The centriole in the dumb-bell stage. Taken from an egg in the 

 anaphase. Iron haemato.xylin. X 1920. 



Fig. 28. Late anaphase of first maturation. The centriole has broken up into a 

 number of granules. In the outer centrosome no differentiation 

 (centriole) is found in the centroplasm. Iron haematoxylin and 

 Bordeaux red. X 1920. 



Fig. 29. Chromosomes are dividing. A deeply staining chromatin thread exists 

 between the components of each pair. Iron liaematoxylin. X 1224. 



